invalid ip blocker script not work on my page!

[jayarukshanth]

I am trying to put my invalip ip blocker script in my php page. But it,s not working! Plz help me to do it for best. I put these code on my page of site!
<?php
$ip=$_SERVER['REMOTE_ADDR']; function validateIP($ip)
{
$regexp = "([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})";
$validate = ereg($regexp, $ip);
if ($validate == true)
{
return true;
}
else
{
return false;
};
?>
plz help me to solve this problem. Thank you!

[arnage]

Deprecated ereg. Just read posted threads, its solved many, many times.

function validateIP($ip) {
if (preg_match('/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/D', $ip)) {
return true;
} else {
return false;
}
}